I fixed several of the problems in my train algorithm. Now I can actually
make a working story around a train ride....

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somehow the wagons (especially the last one) seem to shear.

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dang!

I thought I noticed this before, but you're right.

I find four new corners for the cars based on the rails and then use this
reorient macro:

#macro AlignToRect2(pAb, pAf, pBf, pBb)  // by  Charles Fusner and Slime
     #local newz = vnormalize(pAf-pAb);
     #local newx = vnormalize(pBb-pAb);
     #local newy = vcross(newx,newz);
     #local avey=(pAb+pAf+pBf+pBb)/4;

     matrix <
         newx.x,newx.y,newx.z,
         newy.x,newy.y,newy.z,
         newz.x,newz.y,newz.z,
         avey.x, avey.y, avey.z
     >
#end

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